import axios from 'axios'
import { Notification, MessageBox, Message, Loading } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'
import errorCode from '@/utils/errorCode'
import { tansParams, blobValidate } from "@/utils/ruoyi";
import { saveAs } from 'file-saver'

let downloadLoadingInstance;
// 是否显示重新登录
export let isRelogin = { show: false };

// 缓存工具
const cache = {
  session: {
    getJSON(key) {
      const value = sessionStorage.getItem(key);
      return value ? JSON.parse(value) : null;
    },
    setJSON(key, value) {
      sessionStorage.setItem(key, JSON.stringify(value));
    }
  }
};

// 处理重新登录
const handleReLogin = () => {
  if (!isRelogin.show) {
    isRelogin.show = true;
    MessageBox.confirm('登录状态已过期，您可以继续留在该页面，或者重新登录', '系统提示', {
      confirmButtonText: '重新登录',
      cancelButtonText: '取消',
      type: 'warning'
    }).then(() => {
      isRelogin.show = false;
      store.dispatch('LogOut').then(() => {
        location.reload();
      });
    }).catch(() => {
      isRelogin.show = false;
    });
  }
};

// 刷新token
const refreshToken = async (store) => {
  try {
    await store.dispatch('RefreshToken');
    return true;
  } catch (error) {
    console.error('刷新Token失败:', error);
    return false;
  }
};

// 创建axios实例
const service = axios.create({
  // axios中请求配置有baseURL选项，表示请求URL公共部分
  baseURL: process.env.VUE_APP_BASE_API,
  // 超时
  timeout: 10000
})

let isRefreshing = false;
let subscribers = [];

// request拦截器
service.interceptors.request.use(config => {
  // 是否需要设置 token
  const isToken = (config.headers || {}).isToken === false
  if (getToken() && !isToken) {
    config.headers['Authorization'] = 'Bearer ' + getToken() // 让每个请求携带自定义token
  }
  return config
}, error => {
  console.log(error)
  Promise.reject(error)
})

// 响应拦截器
service.interceptors.response.use(res => {
  // 未设置状态码则默认成功状态
  const code = res.data.code || 200;
  // 获取错误信息
  const msg = res.data.msg || errorCode[code] || errorCode['default']

  // 二进制数据则直接返回
  if (res.request.responseType === 'blob' || res.request.responseType === 'arraybuffer') {
    return res.data
  }

  if (code === 401) {
    if (!isRefreshing) {
      isRefreshing = true
      // 尝试刷新token
      return refreshToken(store).then(success => {
        if (success) {
          // 重新发送所有等待中的请求
          subscribers.forEach(callback => callback())
          subscribers = []
          return service(res.config)
        } else {
          handleReLogin()
          return Promise.reject('需要重新登录')
        }
      }).finally(() => {
        isRefreshing = false
      })
    } else {
      // 添加到等待队列
      return new Promise(resolve => {
        subscribers.push(() => {
          resolve(service(res.config))
        })
      })
    }
  } else if (code === 500) {
    Message({
      message: msg,
      type: 'error'
    })
    return Promise.reject(new Error(msg))
  } else if (code !== 200) {
    Notification.error({
      title: msg
    })
    return Promise.reject('error')
  } else {
    return res.data
  }
},
error => {
  console.log('err' + error)
  let { message } = error;
  if (message == "Network Error") {
    message = "后端接口连接异常";
  } else if (message.includes("timeout")) {
    message = "系统接口请求超时";
  } else if (message.includes("Request failed with status code")) {
    message = "系统接口" + message.substr(message.length - 3) + "异常";
  }
  Message({
    message: message,
    type: 'error',
    duration: 5 * 1000
  })
  return Promise.reject(error)
})

export default service

// request拦截器
service.interceptors.request.use(config => {
  // 是否需要设置 token
  const isToken = (config.headers || {}).isToken === false
  // 是否需要防止数据重复提交
  const isRepeatSubmit = (config.headers || {}).repeatSubmit === false

  // 设置默认的Content-Type
  if (!config.headers['Content-Type']) {
    config.headers['Content-Type'] = 'application/json;charset=utf-8'
  }

  // 添加token到请求头
  if (getToken() && !isToken) {
    config.headers['Authorization'] = 'Bearer ' + getToken()
  }

  // get请求映射params参数
  if (config.method === 'get' && config.params) {
    let url = config.url + '?' + tansParams(config.params);
    url = url.slice(0, -1);
    config.params = {};
    config.url = url;
  }

  // POST请求数据处理
  if (!isRepeatSubmit && (config.method === 'post' || config.method === 'put')) {
    // 如果是form-urlencoded格式，转换数据
    if (config.headers['Content-Type'] === 'application/x-www-form-urlencoded') {
      config.data = tansParams(config.data)
    }

    const requestObj = {
      url: config.url,
      data: typeof config.data === 'object' ? JSON.stringify(config.data) : config.data,
      time: new Date().getTime()
    }
    const sessionObj = cache.session.getJSON('sessionObj')
    if (sessionObj === undefined || sessionObj === null || sessionObj === '') {
      cache.session.setJSON('sessionObj', requestObj)
    } else {
      const s_url = sessionObj.url;                  // 请求地址
      const s_data = sessionObj.data;                // 请求数据
      const s_time = sessionObj.time;                // 请求时间
      const interval = 1000;                         // 间隔时间(ms)，小于此时间视为重复提交
      if (s_data === requestObj.data && requestObj.time - s_time < interval && s_url === requestObj.url) {
        const message = '数据正在处理，请勿重复提交';
        console.warn(`[${s_url}]: ` + message)
        return Promise.reject(new Error(message))
      } else {
        cache.session.setJSON('sessionObj', requestObj)
      }
    }
  }
  return config
}, error => {
    console.log(error)
    Promise.reject(error)
})

// 响应拦截器
service.interceptors.response.use(res => {
  // 二进制数据则直接返回
  if (res.request.responseType ===  'blob' || res.request.responseType ===  'arraybuffer') {
    return res.data
  }

  // 处理OAuth2错误响应格式
  if (res.data.error) {
    const errorMsg = res.data.error_description || res.data.error
    Message({
      message: errorMsg,
      type: 'error'
    })

    // 如果是token过期或无效，尝试刷新token
    if (res.data.error === 'invalid_token' || res.data.error === 'unauthorized') {
      const retryOriginalRequest = new Promise((resolve, reject) => {
        // 将请求加入队列
        subscribers.push(() => {
          config.headers['Authorization'] = 'Bearer ' + getToken();
          service(config).then(res => {
            resolve(res);
          }).catch(err => {
            reject(err);
          });
        });
      });

      // 如果不是刷新token的请求
      if (!config.url.endsWith('/auth/refresh-token')) {
        if (!isRefreshing) {
          isRefreshing = true;
          refreshToken(store).then(() => {
            isRefreshing = false;
            subscribers.forEach(callback => callback());
            subscribers = [];
          }).catch(err => {
            isRefreshing = false;
            subscribers = [];
            handleReLogin(); // 刷新失败，触发重新登录
          });
        }
        return retryOriginalRequest;
      }

      handleReLogin()
    }
    return Promise.reject(new Error(errorMsg))
  }

  // 处理普通响应
  const code = res.data.code || 200;
  const msg = errorCode[code] || res.data.msg || errorCode['default']

  if (code === 401) {
    handleReLogin()
    return Promise.reject('无效的会话，或者会话已过期，请重新登录。')
  } else if (code === 500) {
    Message({
      message: msg,
      type: 'error'
    })
    return Promise.reject(new Error(msg))
  } else if (code === 601) {
    Message({
      message: msg,
      type: 'warning'
    })
    return Promise.reject('error')
  } else if (code !== 200) {
    Notification.error({
      title: msg
    })
    return Promise.reject('error')
  } else {
    return res.data
  }
},
error => {
  console.log('err' + error)
  let { message } = error;
  if (message == "Network Error") {
    message = "后端接口连接异常";
  } else if (message.includes("timeout")) {
    message = "系统接口请求超时";
  } else if (message.includes("Request failed with status code")) {
    message = "系统接口" + message.substr(message.length - 3) + "异常";
  }
  Message({
    message: message,
    type: 'error',
    duration: 5 * 1000
  })
  return Promise.reject(error)
})